Traditionally, vodka was made from potatoes, corn or grains, but it is now made from a range of exotic bases including grapes, maple syrup and even soybeans. Unlike Scotches and cognacs, which are made in pot stills, vodka is usually produced in a high-volume, continuous column still. After distillation, the spirit is filtered to remove any remaining impurities. Coal is a traditional filter, but brands today use a range of materials, even including diamonds. Vodka isn’t aged and can be bottled and sold immediately after production.